Paul from SWISCO responded:
April 18, 2017
Start by looking at our 39-015. This may be what you have, however I'm not sure about the "wingspan" of your arms. See how well ours matches up to yours.
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Paul from SWISCO responded:
April 20, 2017
You'll probably have to remove the wood trim over the sill. See the video below. It features a different operator, but the method of removing the sill trim is more or less the same.
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